Drill or other impact mechanism.



G. CONDE@ DmLL 0R OTHER MPAGT MEG-Hmmm.

APPLICATION FILED MAY 31,1907.

SHEET l.

3 SEEE Patented Aug. l, 1911.

WH'NESSES;

G. H. GONBIOT.

DRILL 0R OTHER IMPACT MBGIIANISM.

AIILIOATIOII FILED MAY 31,1907.

Patent-ed Aug. l, 191]..

3 SHEETSSHBET 2.

WITNESSES.

G. H. CGNDIGT.

DRILL 0R OTHER IMPAGT MEGHAMSM.

AILIGATION FILED MAY 31.1907.

3 SHEET SHEET f3.

if w

WITNESSES mvvm,

. which the drill bit is reciproeated or is methods are connnonly employed 1for recipactuated jby a 'crank o1' equivalent mechaeiprQCatOry', thev power twingusually furnished by an electric motor. irills of this 25 springs, and the like have been used. "lne --reci nocating,` elementby means of a. solewhich is periodically reversed.

ble to he encountered.

.communicated to vthe operating` mechanism UNITED 'STATES PATENT oiuuon.

`-GEORGE HER-BERT CONDCT, OF PLINFIELD, NEW' JERSEY, ASSIGNOR TO WILLIAM BULLES. QF EGLEVOOD, NEVI JERSEY.

DRILL (333,l OTHER IMPACT MEGHANISM.

Specification of Application led May 3l,

Letters Patnn Patented Aug. 1, 1911. iso-7. senza No. :at/eme.

lo (LU whom. 1f/may concern:

Be it known that l, Geenen llinnsnn'r ConYA mc'r, acitizen oi the United States of America, residing in Plainfield, county of Union, and State ot New Jersey, have invented certain new and useful improvements in Drills or other impact Mechanism, oi' which the following` is a speciiicatirm, reference being had to the drawings, forming partot the same.

My linvention relates to rock drills, in

struck b f -a hammer to produce the desired impact on the rock, and the primary' object of my invention is to provide an improved opera-ting mechanism for the drill.

. L In drills of the kind referred to, two

rocating' the drill hit or actuating` the hammer. ln oneof these the moving element is nism for convertingrotary mot-ion into retype are notably convenienuand ei'licient in operation, but are subject to one drawback in particular, namely, the tactv that the impacts or" the drill hit or the hammer are and lother parts of the drill, thus subjecting the same to injurious shocks and vibration. 'I o overcome this diliculty, cushioning'dcvices of various kinds, such as airseushions,

other method referred to is to actuate the noi or. elect1o111agnet, the polarity 'of In this method the injurious vibration and shocks such 'as are incident to the first-mentioned plan, are largely reduced, but the solenoid method possesses a serious drawback in that l ajspecial generator of comparatively low frequency,v is necessary, to supply the current Afor energizing the solenoid. This is for the reason that the current commonly vfurnished by power and lighting companies is .of too high frequency vfor the. best, or in some cases -even goed, results in the drill. On the other hand, i" direct current he cmployed,\, ivith commutating devices'lor pro` dur-,ing the necessary reversals of the cur rent, the usual eommutator troubles are liabut may he constant. I can therefore employ direct current for energizing the magnet,-thus, eliminating the special lovvfrequency aiternator. and the commutating devices heretoitore commonly considered necessary. `instead, I provide mechanical means for rapidly reciprocating a carrier which loosely supports an impact element or hitA so that the latter may have movement relative thereto, and employ a solenoid or other electrosmagnet which servesto couple the impact element or hit to. the carrier'to move in unison therewith, no other means being necessary or employed than the solenoid or ,magnetior coupling the parts as stated. "Hence, so far as eonnnunication oit vibration anti shock from the drill hit or hammer to tne rest of the apparatus is concerned, the drill is at least as .free from such eli'ects as the former types of solenoid drills. On the other hand, the carrier does not strike a hlowupon anything and hence is the source of substantially only such vibration as incident to its canlr mechanism.

'lho preferred torni of apparatus thus hrieiy outlined is illustrated in the annexed drawin in which-H Figure l is a view in side elevation with a portion oi the outer casing of the drill broken away. Fig. Q is a vertical section, .showing the operative parts of the/drill partly in elevation. Fig. 3 .is a section suh- .sranl'ially on line` lil.- -lll.,or Fig. 8. Figs. 5 and-(3 are enlarged sections on line l dir., V-V., and VI.-Vi., respectively oi" Fig. 9, showing diil'erent portions of the v mechanism for-rotating the drill hit. Fig'. 7 is a detail view,- in side elevation, of the or other actuating upper part of the` drill, showing the position oi the dri ving motor and its operative connection Withthe restof the apparatus. Figs.

v the casing* and the parts carried thereby can `-Suitable connections not shown for energizing this magnet, and it will be reciprocating the carrier,`

" one end of the shaft is a gear 8 and E) are views of a modified form of my invention.

rlhe operative parts of the drill are contained in and supported by an outer casing 1, which it will be noted is of general cylindrical contour, although of course, the exact form of the casing is of little consequence as long as it serves the purpose for which. it is employed. l prefer to make the casing in t\.'o'separable longitudinal parts or halves, 2, 3, the line of division between the same being vindicated: at i, to permit assemblage of the apparatus and afllord quick and easy access to the inclosed parts. The casing is provided at top and bottom with-lugs or y projections o, 6, Iadapted lto slide in guides formed on a supporting 4member 7. Rotatively mounted in the top of the latter is a screw 8, working in the upper ctising lug and providedwith a hand cranlri), so that be lowered, in the usual way, as the work of drilling progresses, The supporting member '7 is removably mounted on the usual tripod or other support, a portion of which is indicated at l0, in Fig. 8.

v Mounted in the casing, -are upper and lower wrought iron collars, ll. 1Q, spaced apart as shown, and secured rigidly in place by any suitable means, such as bolts 155, let through the casing wall and threaded into said collars.

Located within the casing, and in the spaee between the collars l1 and 12, is an annular electro-magnet or solenoid 14, of substantially the `saine internal diameter as said collars and of general shape such as to snugly fit in thespace between said collars, so to have no movement relative to the casing. )tn other words, the solenoid or magnet is Xed-or rigidly mounted in the casing and maintains the position set forth throughout the operation of the machine. are provided saidmagnet is enerbecomes the l0 constitute apparent that when the giaed, the surrounding casing tield of which the collars 1l, the pole-pieces. y

lrtending through the alining openings in the pole-pieces vand the solenoid is a closely litting cylinder or'sleevc l5I of brass or other metal of non-magnetic qualities, and mounted to reciprocate through the passageway thus' formed is a mechanically operated carrier adapted to carry an impact element or bit so as' to impart the desired reciprocations to the latter. This/carrier consists of a tubular or. hollow element 16 of brass, having rigidly'connected to its upper end a head l?, also of brass. For the purpose of the head 17,- is connected with a crank '.18 on a shaft 19 journaled in opposite sides of the casing.

:vertical shaft 34e, (Figs. 2,

itt' 9.0, meshing eea/iss with the driving gear 2i or a motor inclosed in a case 22 mounted on the top of the drill casing l. The motor may of course be of the. alternating` or the direct current type, and may be connected with a source of current in any suitable way, not shown.

Arranged to reciprocate inside the field core or carrier 1G is a plunger 23,v constituting the armature of the solenoid or magnet, and the impact elementl which strikes the drill bit Q4,

said plunger being disposed to slidel in bearing sleeves or pole pieces 26. of wrought iron secured in and to the upper andlover ends of the carrier -respectively. llt will be seen, upon reference to the drawings, that there is no operative mechanical connection between the plunger and the rest of the apparatus, the former being free to reciprocate independently of the latter.

The collars or sleeves Q6. are so connected and arranged upon the carrier as to have their louter cylindrical faces in close proximity to the lining sleeve l5, As the. carrier reciprocates the magnetic field or circuit of the solenoid or magnet will include said collars, and constitute them magnets to attract the plunger and couple the latter with the carrier, so that said plunger will travel in' substantial unison-with the carrier during the drilling operation.

The drill bit 24 is chamfered near its upper end vto provide a flat port-ion 25a which ts loosely a slot extending laterally from a ci rcular aperture 26 (Fig. 5) in a plate 2i'. The latter is movably mounted in a recess 2S in the bottom of a chuck 29, rotatively carried in the lower end of the casi ng l. The plate 27 is held in its outermost position, with its slot engaging the ychamfered portion of the drill bit, by springs 30 bearing on lugs 3l. on the said plate, the result being that while a slight up and down play of the bit is permitted it can not rotate relatively to the chuck 29. a gear 32, meshing with a pinion 33 on a and G) the upper end of which is provided with inclined or helical grooves 35 engaged by corresponding ribs on the inner. surface of a ratchet 36. The latter is carried in the'head in a bracket 37 of bronze secured tol the sleeve 26, and is engaged by a pawl 3S, but is caable of sliding movement on the groovcd end of shaft 34 as the carrier 16 reciprocates.-

It will therefore be evident that as the At the top of the chuck is vratchet descends with the carrier 1G the' bottom of the bore in the rock. the engagement 'of the bit therewith otlors sullieient resistance to prevent the shaft 3ft from lrotating., since the ratchet offers practically no resistance to the turning effort. The ratchet therefore turns on the down-strekc of the carrier, but on the 11p-stroke the pawl holds the ratchet from turnme in the ori-i posite direction, as would otherwise happen; hence the shaft 34 must turn, and give the bit a slight movement of rotation, the ei;- tent of which depends, of course,on the pitch or angle of the grooves S5 with the vertical, the extent of the upward movement of the ratchet, and the ratio of the gear 32 to the pinion 33. In this way the bit is given a slight turn ateach upward movement of the hammer 23, since the latter, as will be explained hereinafter, follows the movement of the carrier or core 16.

Assuming now that the soleniod le is connected in any suitable way, not shown, with a source of direct current the polarity of the magnet will. therefore be constant. But as the carrier lreciprocates, the impact element- 23, under the magnetic attraction of the solenoid exerted thereon through the collars 25, 2G, will be magnetically coupled to the carrier and be moved in substantial synchronism or unison therewith. `With the parts in the position shown in Fig. 2, and

-the carrier descending, itis evident while the latter is slowing up before the reversal of its motion takes place the momentum of the hammer will throw it down in advance of the carrier and cause it to stril-:e the drill bit or other clement. Upon the return movement of the carrier 16, the bit or impact element 23 will be raised therewith under the influence of the solenoid or magnet 14 through the collars, and moved wardly or rearwardly until the overthrow of the crank 18 causes the carrier 16, and impact element or bit 23 to descend in sub stantial synchro-msm or unison to repeat the blow. The operation just stated is continued as long as the shaft is rotated and the solenoid 14 is energized.

It might be stated that when the carrier '16 has about reachedthe limit ot ils downward stroke and thereby decreased in speed, as the crank is 'about to turn on its upstroke, the momentum gathered by the ele ment 23 may cause it to gain upon the car rier and move in advance thereof, but it will be seen that when the blow has been dei livcred that the element 23 will not only rebound to a degree, beingl loosely mounted on the carrier 16, but will also be raised under the influence ot the magnet or solcnoid to substantially its initial position with relation to the carrier.

mounting the impact element Q3 looselyl within the carrier and providing the improved means for causing them to move in substantial unison, a great advantage is attained in that upon the delive; f l

or the blow the rebound of the element 2e, independently of the carrier, relieves said car- ,tier and its operating mechanism of a great part of the shock to which it would' be sul jectcd were the arrier and element 223 rig'- idly or positively connected.

in Figs'. 8 and ot' the drawings l have shown modified term oi' the invention: ln this embodiment, the casing and parts appertaining thereto are substantially the saine in construction as the corresponding parts heretofore described and it is therefore unnecessary te repeat such description. ihe modified form contemplates the mounting ot' the solenoid directly upon the carrier so as to reciprocate therewith instead making the same stationary on the support, and in the illustration made 3f) designates the tubular carrier reciprocably mounted in the casing and guided by upper and lower guide collars 40. 41 at the upper and lower portions ci the casing, the carrier being connected to a crank movement indicated generally at i2 by means of which it -1s reciprocated. les shown, the carrier has mounted thereon an annular magnet 4-3 through which it passes, the same being .located in an enlarged portion ol the casing as shown, and within the carrier, is loosely m=' tmted an impact element sie constituting the armature ot the magnet. rlhe axial portions i of the impact element are mounted. to slide in a beari sleeve 45 secured in and to the upper part oi the carrier, and a head 4o secured in the lower end of the carrier, the latter also serving to retain the impact element in the carrier. it will be apparent that the solenoid being energized, that it will serve by its magnetic iniluence to couple the impact element or bitto the carrier dur ino` the rcciprocations ot' the latter.

What I claim is:

1. The combination of a rcciprocatory carrier or licld core havingseparated pole pieces, an impact elcn'ient moving with the carrier or 'icld core and having magnetizable parts in proximity to said pole pieces, said pole pieces being connected` by means servin to malte gaps in the magnetic circuit, id a fixed clectri'miagnet acting throngn )aid pole pieces to couple the reciprocating carrier or field core and impact clement to canse them to move in unison.

in combination with a iiKed electromagnet, a rerun-oratory carrier or lield core having mechanically connected separated 4pole pieces forming part ot' the magnetic circuit of said eiectronnxgnet, and a. mow able impact element closing the magnetic circuit from pole pic@l to pole piece whereby said impact element willl be caused to move in unison with the rtuziprocatory carrier or iieid core.

rthe combiinaiion with a coil ot a field coro within the field of said coil, said field core consisting of magnelizable pole pieces separated and comiected by a non-magnetic connecting piece, means for causing the field eoi'e to be i'ooi prooated, and a movable armature Within mici ieid Coi-e.

1. The combination of a rceipfocatoiy Cai-rior oi' iiehl Core having Separated polo Apiece connected by a non-magnetic connecting piece, an inn/)act element moving with the carrier of held core and having magnetizahle gai'te in proximity to said polo pieoos, and a fixed eleoti'omagnot acting` through said pole pieces to Couple the rociprooatingg cai-riet' or ield ooi-e and impact element to cause them to move in unison.

r"he coiiihiiiat'ion ol. a lixed electromagnet, a i'ecipi'ocatory carrier o1' field ooie having pole pieces arranged in the magnetic Circuit of said n'xapnet and non-magnetically Connected toqjetheiv` and a magnetizable impact element movably mounted in said polo pieces, whereby the magnetic Circuit of the 'election]agnet, through the pole pieces and the impact element, will couple the impact G. HER-LERT GONDCEX lWitnesses S. S. DUN-IAM, M. LAWSON Dylan. 

